王晓萌,杨绍贵,孙成,何欢,李永.复合材料BiOI/BiOCl的制备及可见光催化降解活性艳红X-3B[J].环境科学学报,2014,34(9):2226-2232
复合材料BiOI/BiOCl的制备及可见光催化降解活性艳红X-3B
- Preparation of composite material BiOI/BiOCl and its visible-light photocatalytic degradation of Reactive Red X-3B
- 基金项目：江苏省自然科学基金（No.BK2012732）
- 王晓萌
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 杨绍贵
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 孙成
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 何欢
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 李永
- 南京大学环境学院, 污染控制与资源化研究国家重点实验室, 南京 210023
- 摘要：以乙二醇为溶剂，利用溶剂热方法制备了不同I/Cl比的BiOI/BiOCl可见光催化材料.同时，采用X射线衍射光谱（XRD）、X射线光电子能谱（XPS）、紫外可见漫反射光谱（DRS）和光致荧光光谱（PL）对所制备材料的晶相、元素价态和光学性质等进行了表征，并以活性艳红X-3B为目标化合物，研究了不同I/Cl比对X-3B光催化降解动力学的影响.分析结果表明，BiOI和BiOCl能够得到很好的复合，在可见光范围内有很好的吸收.降解实验结果表明，I/Cl摩尔比为9：1时，复合材料对X-3B的可见光降解效率最高，一级反应动力学速率为0.0133 min-1；TOC和COD在3 h内分别降低28%和25%左右，证明能够对所选目标染料在一定程度上实现矿化；在光催化降解活性艳红X-3B过程中起主要作用的为光生空穴.此外，还对复合材料光催化性能提高机理进行了探索与推测.
- Abstract：Composite materials BiOI/BiOCl with different I/Cl molar ratios were successfully synthesized through an EG-assisted one-pot solvothermal method. Their crystalline phase, valence state of elements and optical property were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),UV-Vis diffuse reflectance spectroscopy(UV-DRS) and Photoluminescence(PL). The results showed that composite materials had a good absorption capacity for visible light. Visible light photocatalytic activities of composite materials prepared were evaluated by degrading reactive red X-3B. The results indicated that the visible-light degradation efficiency of reactive red X-3B was the best over BiOI/BiOCl, whose ratio of I/Cl was 9:1, and its first-order kinetic rate constant was 0.0133 min-1. TOC and COD decreased 28% and 25% in 3 h, respectively, which meant the partial mineralization of reactive red X-3B using the material. The main reactive species in photocatalytic degradation process was photogenerated hole. In addition, the possible mechanism for the improvement of photocatalytic activity was proposed.
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